title: Grasp posture planning during multi-segment object manipulation tasks - interaction between cognitive and biomechanical factors.
abstract: The present study examined adaptations in the planning of initial grasp postures during a multi-segment object manipulation task. Participants performed a grasping and placing task that consisted of one, two, or three movement segments. The position of the targets was manipulated such that the degree of object rotation between the home and temporally proximal positions, and between the temporally proximal and distal target positions, varied. Participants selected initial grasp postures based on the specific requirements of the temporally proximal and temporally distal action segments, and adjustments in initial grasp posture depended on the temporal order of target location. In addition, during the initial stages of the experimental session initial grasp postures were influenced to a larger extent by the demands of the temporally proximal segment. However, over time, participants overcame these cognitive limitations and adjusted their initial grasp postures more strongly to the requirements of the temporally distal segment. Taken together, these results indicate that grasp posture planning is influenced by cognitive and biomechanical factors, and that participants learn to anticipate the task demands of temporally distal task demands, which we hypothesize, reduce the burden on the central nervous system.
authors.affiliation: Neurocognition and Action Research Group, Faculty of Psychology and Sport Sciences, Bielefeld University, 33501 Bielefeld, Germany; Research Institute for Cognition and Robotics (CoR-Lab), 33501 Bielefeld, Germany. Electronic address: Christian.Seegelke@uni-bielefeld.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Seegelke
authors.forename: Charmayne M L
authors.initials: CM
authors.lastname: Hughes
authors.forename: Andreas
authors.initials: A
authors.lastname: Knoblauch
authors.forename: Thomas
authors.initials: T
authors.lastname: Schack
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D001696:Biomechanical Phenomena; D003071:Cognition; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D007858:Learning; D008297:Male; D009068:Movement / Q000502:physiology*; D011187:Posture / Q000502:physiology*
keywords: 2330; 2340; 2343; Grasp adaptation; Motor planning; Multi-segment action sequence; Object manipulation